102 PROCEEDINGS OP THE AMERICAN ACADEMY 



V. 0.6697 grm. of the anhydrous salt gave on ignition with HgSO^ 

 0.2080 grm. BaSO, . 

 VI. 0.5032 grm. of the anhydrous salt gave 0.1570 grm. BaSO^. 

 VII. 0.4959 grm. of the anhydrous salt gave 0.1527 grm. BaS04. 



Calculated for BaiCgClBrlO-i) 2 • S^H^O. 



I. 

 HgO 7.67 7.71 



Calculated for Ba(C3ClBrI0.2)2 

 Ba 18.07 



The solubility at 20° was determined by evaporating a saturated 

 solution to dryness and igniting the residue with sulphuric acid. 



I. 3.7500 grms. solution gave 0.2339 grm. BaSO^. 

 II. 3.1458 grms. solution gave 0.1957 grm. BaSO^. 



According to these determinations a solution saturated at 20° con- 

 tains the percentages : — 



I. II. 



20.30 20.23 



Calcic chlorhromiodacrylate Ca(C3ClBrI02)2 . HgO. 



When a solution of the acid is neutralized with calcic carbonate, 

 and the filtered solution concentrated by evaporation, the calcium salt 

 separates in the form of branching needles. The air-dried salt con- 

 tains one molecule of crystal water, which it loses at 80°. 



I. 0.7180 grm. of the air-dried salt lost 0.0216 grm. lip at 80°. 

 II. 0.6770 grm. of the air-dried salt lost 0.0197 grm. H2O at 80°. 

 III. 0.6583 grm. of the anhydrous salt gave 0.1404 grm. CaS04. 



Calculated for Ca(C3ClBrI0.2)2 . HgO. Found. 



I. II. 



H2O 2.66 3.01 291 



Calculated for Ca( CgClBrlOo)^ . Found. 



III. 

 Ca 6.05 6.27 



